<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>引入方式</title>
</head>

<body>

    <!-- 行内js：必须是事件格式 -->
    <button onclick="console.log('点击后执行')">按钮</button>

    <script>
        console.log('内部js')
    </script>

    <!-- 引入外部js -->
    <script src="./my.js"></script>
</body>

</html>